Figxxii



APPLICATION FILED MAR. 12. I917- Patented May 24, 1921.

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Inventor FIJ Tillman flttys 4 m. TILLMAN. CALCULATING ATTACHMENT FOR TYPEWRITING MACHINES.

arucqwa FILED' ma. \2. 1911. 1 1,379,322. Patented May 24,1921.

' H SHEETS-SHEET2.

Inventor EJTilZman' %mm wigs Mr W T mw .M n a NNNMWR. W N

Pawnted May 24, 1921.

fzwentort Fr/T'Tz'lZman 7 F. 1. TILLMAN. CALCULATING ATTACHMENT FORTYPEWRITING MACHINES.

MPLICATION FILED MAR. I2. 1911-.

By WW1 My l F. J. TILLMAN.

CALCULATING ATTACHMENT FOR TYPEWRI TING MACHINES.

APPLICATION FILED MAR. 12' 1911- Patented May 24, 1921.

14 smears-sun 5.

. wENmQ Inventor FJ Tillman MTfiflttys F.1. TILLMAN. CALCULATING ATTACHMfiNT FOR TYPEWRTING MACHINES.

v APPLICATIOH fll-ED MAR. IL 517- 1,379,322. Patented May 24, 1921.

14 SHEETS-SHEET 6.

Inventor 7% dttys F. 1. muvlm. CALCULATING ATTACHMENT FOR TYPEWRlTING MACHINES. APPLICATION FILED MAR. l2, I911.

14 susns suzn Inventor FIJI Tillman F. J. TILLMAN. CALCULATING ATTACHMENT FOR TYPEWRITING MACHINES.

APPLICATION men ma. :2. 191?.

,379,.322. Patented May 24, 1921.

H SHEETS-SHEET 8.

4- lzzziezztor ffcf. Tillman 'F. l. TILLMAN.

CALCULATING ATTACHMENT FOR TYPEWRITING MACHINES.

APPLICATION mm m. 12. m1.

1,379,322. Patented May 24,1921.

l4 SHEETS-SHEET 9.

ngxm z Fl' XX/y nyxxrz Hz 116 m; 71: 1+7

fgzvezztor 17:7. Tz llman By Wigs r. 1. TILLMAN CALCULAUNG ATTACHMENT FOR TYPEWRIHNG MACHINES.

'MPUCATION FILED HAIL l2. lSU.

1,379,322. Patented May 24, 1921.

H SHEETS-SHEET l0.

An I

rm .MIH rna? 1? i a fzwezz tor Fr): Tillman F. J. TILLMAN.

CALCULATING ATTACHMENT FOR TYPEWRITING MACHINES.

APPLICATION man MAR. 12. is.

1,379,322. Patented May 24,1921.

I4 SHEETS-SHEET I l Inventor Er)? Tillman F. J. TILLMAN.

CALCULATING ATTACHMENT FOR TYPEWRITING MACHINES.

APPLICATION nun v1.12. 1911'.

1,379,322. Pawnwd May 24,1921.

l4 SHEETSSHEET l2.

Inventor Fr]. Tillman By W F. .l. TILLMAN.

CALCULATING ATTACHMENT FOR TYPEWRITING MACHINES.

' APPLICATION mm mm. 12. m1.

1,379,322. T Patented May 2-4, 1921.

- Fl. lSHEETs-sllil' T3.

222 22 muff |e mflw g .9. /5

1' WM m] 1 5mm W Flyxxxvmr. 234- 1m MT Illl 22.6 ml um nu 1m w: 1 237 //////7////// 224 232 fu vezztor Ed Tzllman F. 1. TILLMAN. CALCULATING ATTACHMENT FOR TYPEWBITING MACHTNES.

APPLICATION FILED MAR. IZ I9!!- 4 D 2.. 7 3 v. 7 7 m 4 MN MW M 0 2 M 2 m j m ...,....w.wr w m .3 2:

:U!!! *ffl n ,2 3 2 Inventor ET}: Tillman "1' for. cooperation therewith.

--= tram of gearing STAT-ES 'P NTaOF' ermann I, T uman; i" s n s. ism$ 111 assessed msw m 'cucnnamnie arracnmn'nrcomr A {A 'cqnronh'rrhn' orv mesons:

To dllwf ioinitmaycomemi .LZ Q it known that typewlitin machine of ordinary constructijon,in which there is a platen carriage and numeralike levers, the'attachment being of thegtypei s ownand described in Letters Patentz of the United States No. 1,003,671 issued to me September 19, 1911, and upon which the present invention is somewhat in the nature ofanimprovement.

. Figure'I is a top or plan view of-my calculatin gmachine except for the parts carried ythe typewriting machine, which is omitted from this view.

II is a vertical lon itudinal section through theflcalculating mac iine and a typewriting'machine resting thereon in position 'Fi III is an edge view of one of the clips attached to the numeral. key levers of the typewriting machine to receive the connectors in the calculating machine.

F ig. IV is a side view of the clip shown in Fig. III.

.Fig; V is an enlarged lon itudinal section through the forward portion of the calculating machine on a line adjacent to a leading from the mechanism directly operable by the numeral key levers of the typewriting machine to the register-in mechanism.

Figs. VI to IX, inclusive, are detail views of eoiiperable cam members in the machine.

FigsLX'and XI are respectively top and side views illustrating means for preventing operation of the integer 1 key lever of the typewriting machine under a certain condition; a

Fig. XII isa top or plan view of the gearing shown in Fig. V.

Fig. XIII is a longitudinal section thi-ough'the machine taken on a' line at the opposite sideof the parts shown in Fig. V

I Specification of Letters Patent} Patentd M Application filed March 12, 1917.

Serial no; 154.1% 1

. -Fi XIII isa section on line'XIIP- XII Fi I. l Fig. fix is a front=elevatib1i of the calculati machine, the accumulator being omitte 1* Y Fig. XIV is a detail view'of the shifter operating members used-in *changin from one descri tion of calculation to 'anot er.

..F X :.i;s a'vertical transverse section throughthe calculating' machine at a point immediately front-of the integer wheel shaft and the means for. operating shaft,

which are; under control of the numeral key levers; of :the typewritin'g machine.

Fig. XVI is an elevationpartly in section illustrating means for preventing movement of the platen 'carriage of the typewriting machine during operation of the calculating mechanism.

1125s :ah .1 -enlarged side elevation of the elements in the mechhnism shown in XVI, supported by'the calculating mach1neh"-- 1 11 Fig; XVIII is a'top view of the parts shown in Fi XVII. V v I 0 Fig. XI is a plah-vie'w; partly in sectron, of the platen carriage escape'ment device of the .typewriting machine and the means directly associated therewith for-locking said escapemenrt; 1-

Figs. XX to XXIX, inclusive, are (liagrauns illustrating the means for necessitating full Stroke. movement of the integer 1 key lever of the typewriting machine.

Fig. XXX is a plan view of the feeder on the platen carriage of the typewriting machina and the mechanism cooperable therewith.

Fig. XXXI is a side elevation, artl in section, of the parts shown in Fig. XX

Fig. XXXII is a view similar to Fig. XXX with the cooperating parts shown in the positions assumed during the movement of the typewriting machine carriage and the feeder carried thereby.

Fig. XXXIII is an eglgge view of the feeder shown in Figs. XX 'toXXXII, inelusive.

Fig. XXXIV is a bottom view of the feeder.

Fig. XXXV is an enlarged plan view, partly broken out, of the accumulator. I Fig. XXXVI is an enlarged rear elevation of the accumulator.

r V The typewrjtingamaohine ri ii XXXvIi iis aniienlargedfl ear-ea cross section through the accumulator r Fig. XXXYIII is an enlarged view f portions-Lot one of itheg secondary ,transmis-Q 1 the accumulator at thedecimal columns s:

Fig. XLI is a bottom View of a portion of the accumulator =adjacent'toa decimal column. a t i 5 My. calculating machine is one intended to be operated: through the medium iofu the numeral key levers of a typewriting machine, typewriting machine may be one of anyioia warietyof such :machines .at present upomthe market, in which there is'a platen carriage and. numeralkey levers as well as letten and other character: keyilevers. shown in'Itheiac companying-drawings '(Eig. :11) has a com mon form'- of keyboard, including numeral keys 1 carried by sp-ring supp'ontedwkey levers 2; pivotally' mounted at their rear ends, Azdesignates the platen. carriage of t-he typewriting machine, which includesa rack ba r a--,that extends longitudinally of the carriage and transversely of the typewriting maehine.-. The said raekibaris'igi-ooved longitudinallycatzthe; front and rear edges, and 1s provided with front and rearv teeth, (see Figs. XXX to XXXII) the teeth at one edgeof the rack bar, for example the front, being the only ones with which the present invention is concerned.- r

The typewritingmachine is mounted upon aatrame which constitutes the frame of-my calculating machine andwhich comprises a base 4, side walls 5 and 6 and a rear member 7. 'At the rear end of said frame is an e:-: tension 8 surmounted by a post 9.

The registering mechanism is located at the frontjo'f the machine and comprises an azcumulator (.3 adjustable .i'rom one position to another;transversely of the machine. The

accumulator seated upona transverse supporting bar 10 and is fitted to a vertically disposedtransverse bar 11- provided. with teethfwith which a latch 12carried by the totalizer engages to hold said totalizer in a positive, position after it has been Set at any point along the bar 11. The accumulator may be of any suitable type containing numeral wheels and transmission wheels by which.the numeral wheels are operatedrbut is preferablyofwthe type and construction hereinafter described. It is well to here mention that theremay be any desired number of transmission wheels in the accumulator and a similar number of numeral wheels operable by said transmission wheels, and that the numbenof the transmission wheels may or may not correspondito the, number oi. numeral: key Rever e .2 the, llypwriting machine used in conjunction with my calculatingmachine. .t t.

. ,Iheqtransmission waasia thafiiiinulator "C" are operated by'a master wheel 14 splined-to a-transyerse haft- 15 journaled in the side walls 5 and 6, said master wheel beinggnoyable along said shaft and into .eu-

gagement with the transmissiom'wheels'of the ancumulator iirrespective of the point at which said accumulator is located transversely of the machine." 1

I will next describe means whereby the accumulator actuating master wheel 14 of my ca-l-culatin machme j is' caused to move along thesha t;15 in'=- -re'sponse to movement of; the platen carriagefof' the typewriting machine: The master wheel14= is fitted toga carriage- D (see Ifig. sliglable upon a guide rod 16 l00ated at 'th r ar of the shaft 15 said carria 'e' D being provid ed with an index finger 1 proximity with -the numeral 2 wheels- 0f the accimiul'a'tor. AW eiidless chain 18; i extendin'g transversely' of the machin'e,gis attached to the; carriage I of the-machine' upon an idler'wheel-l9r- At theioppositeside ofthe machine said endless chain is fitted toa drivewheel 20 'fixedt'o' a rearwardly extending drive" shaft 21 The shatt: i21 -'termi'natesat I the post 5 9 and has fixed to it a be pinion 22 whigh'ineshes with av bei'rel pinion 23 'fixed to a vertical shaft 245 mounted in thepost 9, (see FigaII) The shaft-245 is provided with-one member extending forwardly-into {and is operable atone side 25 of a universal joint to'whichisfitted'the tion sleeve'29which serves to-holdashaft 30 inengagement with the stub shaft 27, the. said shaft 30 havinga non-circular portion slidably fitted'to the non-circular portion 28 ofsaid stub shaft, in order that the shaft 30 may partake of a limited endwise movement and remain cooperable with said stub shaftA 'The shaft 30 leads upwardly to aipoint back of the typewritin'g machine earrimgeA, and is connected by universal joint 31 to a transmission shaft 32vertically positioned in a frame B supported in juxtaposition to the typewriting machinecarriage rackiibiir a. p

The transmission shaft 32 carries a pinion 33, a polygonal disk 34 and a lock disk 35, these arts being most clearly shown in Figs. XXJ to XXXII and being all horizontally arranged'one above the other in the order named, and being all fixed to said transmission shaft? The lock disk 35 is provided with a plurality of vertical notches 36 corresponding-in number to the number of flat faCS30nntl'1e disk-34. 37 is a locking dog pivotediat38 to-the frame-B supporting the rack bar a;

=' Atthe rear edge of :the feeder transmission shaft 32. This l'ockingdog-is vertically disposedand is adapted to enter any-ofthehotches 36 in the locking. disk and beheld therein by a pull spring 39. The locking-dog 37 has aforwardly extending arm-40 which-juts-forwardly over the-locking-.dis'k=35.toa point above the carriage the dog. terminatingat its a front end inlan angular lip 41, the function of which .tobe-hereina-fterfs ecifiedim :TEi:deSi liatesa 'feedelflihee l0 mlvgnadjustably mounted on r the car'- riage' rackihar a. of the typewriting machine,-this-feeder tserving as a medium to shift the master wheel 14 .alongtheifshaft 15 by 'o'peratin'g the idescribed" mechanism leadingg-toandincluding the transmission shaft :32. 5': Said-{feeder-E also serves. to-controlthe operation ofsaid transmission shaft,

as will aappear fromthe .followin :dGSCIi P'e tion. 3The--feeder extends longitudinally of -the -.typewriting. machine. carriage rack bare and the flangesiof the feeder fit against the-front-Qand rear faces of the rack bar a above' thelongitudinal edge grooves therein, and 'one of said -fianges is provided with-a lipf42iwhichenters one of the grooves inthe rack bar to hold that sideof thefeeder from upward movement. The :opposite'side'ofzthe' feeder is held from upward movement by a latch finger carried? by aaverticalq-rod rockably? mounted -in the feeder and pro-i vided with a finger piece 44 subject to the action of a spring 45which tends to-hold the latchafinger 43 in the groove in the-carriage rack bar opposite to that in which the lip 42 seats- Teeth- 46 (see Fig. XXXIV) .proj'ecting-fromthe inner face ofron'e of-the flanges ofthe feeder E engage teeth on the rackgbar .-a-and restrain the feederagainst longitudinalmovement relative to saidrack bar-{so that the feeder is required to partake of whatever movement is partaken of bythe platen carriage of the-typewritirig machines *1 is a rack 47; which is cohperable with the'pin-ion on the transmissionshaft 32 and through the-medium of' which said transmission shaft is-rotated while said parts are in'engagement with each other. -.It will be understood from the foregoing that the feeder E may be held stationary on the carriage rack bar a, and that when its rack 47 engages the pinion: 33 the transmission shaft 325-Wlll be rotated and in turn act to-rol-ate the shafts 30 and 21,.and operate the endless chain 18 to carry the'master wheel 14 along the shaft 15. The

feeder-E is provided at its rear edge andadjacent its endswith flat rear faces 48 and 49 which areadapted to ride in contact with one of, the flat faces of the polygonal disk 34 to.- prevent rotation of the tra nsmission'shaft 32ijust previous to the release of the locking dog. 3'1 fromthenotehed disk 35, andalso just previous touthe reengagement ofsaid locking doga. f-Uponsdihesfeederi E -.is. a vertial'inclined cam 50;:lwhich leads to a vertical flata'unwayifillparallelwith the rack bari a-,-sand--'at thenopposite end lofusaid trunwa'yjis asrver ticabinclinedveam:52amWhen the carriage-of the;- typewriting =machine 1 is advanced ;step byz-s'tepi duringtfthe operation of the mach.ine,"the flatface 48011 :.the feeder E first: comes intozcontactnwith-tone of-the flat faces 1-on.the polygonal disk .34, and; re mains-rin'contaet I therewith until. the angular lip'. 4:1'ibn lthe -lockingrdogdf :has m'oved alongthe: inclined fcam 50 andrpassed onto therfla't 'runway-Fface 51. of the: feeder -E'. lluringltheperiod thatthe lip-ri l of? the locking. dog is traveling :alon'gntherfiafl face 51, the-latch dog ishel 'outgof engagementiwi'th the notcheddisk-fifi and ;the rack AL'ha-viing engaged, the pinion:--33-pn ;the ytransmission shaft: imme iately following the separation ofrthe fiat?-face,fi'om- =the polygonal-1 disk 34, said rack. -is%perri1 itted -.to:rbtate' the'tnans.r mission shift .32'1mtil; -..the rilasta mole-tooth has become, separated fromsaid pinion and the flat face: 4:9; ofst-he feeder-E. memes into t c wit on ofzthe flats a ies o t ion with; etotath notehes inz thehdisk-sfi in-.- position ito. receinwthewlock-ingdog: 40; GOlIlbidQIltrWilthrthlfi approach ofgthn flatface 49to the polygonal difikamtrhq' lip -1fq0f the locking; 'd0g%;reaches;.and rides forwardly along the, inclined cam 52, and said dQgslS permitted, gto enter thgrjiotgh in the. disk; 35. Thefeeder ,E: is adaptedto be adjusted. to any desired pointaalong' the carriage ,rack bar aaccording;- to that corresponding-to the point at wvhich-a (calculation is to- -be ,written upon a (sheet-of. paper; placed. in the platen carriage, and; toassist the-operator. ain1lo calizingthe der, I provideF-a scale on the platen carriagerack .b arg .a-a'nd a pointer 53 t-t e. llzl'." .?.'I- 1? 1 jlhe feeder 3E! is, icofiperahle -wi th the tahu lilting-device ofa typewriting machine com prising' stop; pins .54 r (seei Figs: 'XXX and XXXII) and :key. lever actu ated mechnism ffor advancing .sa'iid jStQp 5 pins into the polygonal disk to again-hold it from. r.ota'-' path; of movement of a: tooth 55- carried by parts 55 and 54 become engaged with each other. 5

.1; will now proceed to a description of-the portion-of the'calculating mechanism having connection with the numeral keylevers of the typewriting,machine-,(see Figs. II and V). 56.- and .57ridesi'gnateflupper; and lower guide i -bars -.;extending'= transversely Efof; my

- with the numeral mentwith'the 'numeral 1k'ey'levers.

calculating machine beneath the numeral key levers 2. '58 are toothed slide bars operable in a vertical direction in said :guide bars. i of the bars 58 arranged in a row transversely of the calculating mechanism' a'ccording'to the integers l-to 9, the integer 1 bar-58 havingone' tooth, the integer 2 bar having'two'teeth, and so on throughout the entire series. :Said toothed 'de'bars 'are' 'movable into engagement with integer wheels, as will be hereinafter more particularly "described. Each toothed bar having azhook 61 at its upper end which is 'open at itsrear'edge. Each hook 61 is'ada p'ted to engage a screw stud 62 formin}; part of'acli secured to a numeral; key lever. The said 0 ip consists, aside from said screw stud, of'a grooved plate 63'fitted to the numeral "key lever and-* held thereto by" a washer-fe t on -'the "screw stud. The cornicetors '59-"are intended be' in engagement key levers of the typewriting machineonly durin calculating operations and it is well to, at this point, describe the mechanism whereby said con into-and out of en ageach connector -59 'ro'vided with a pendant ta'il piec'e 'GQ operab e between 'a' pair of parallel rods 66 extending transversely of the calculating'machine in front of the guide bar 56. ese'rods are mounted in" su porting arms 67 fixed to a rock shaft 68. 'F 68"has' 'fixed to"it'an arm"69 (see Fig. II) provided-jwitha laterally projecting pin 70 which receivesa notch extending upwardly from the 'bottom'of ashifter bar71, which leads rearwardlyfrom said rock shaft, and the "rear end of which is pivoted at 72 to a rocker 73 pivotally connected at 74 to a post 75 on the base of the calculating machine. The rocker 73 is provided at its upper end with a stud 76. 77 isa shift lever pivotally e rear portion of the typewritlng machine at 78 and having its lower end'arranged in contact with the stud 7 6 of the rocker'73; The up r end of the lever 77 is located immediatelg back of'a stud 79 carried by the locking dog 37. In consequence of the positioning of the upper end of the shift lever 77, as ju'st stated', said lever is actuated when the locking dog is thrown rearwardly out of engagement with the notched disk'35 during movement of the typewriting machine platen carriage, and the lower end of the lever 7 7 is moved forwardly with the result of imparting a "forward movement-to the upper end of the lever 73. As a consequence,'the shift bar 71 is drawn rearwardly, the rock shaft 68 is rotated to throw the arms '67 carried thereby in a for ward direction? and the tail pieces of the he rock shaft connectors 59, situated between the rods 66 are moved to throw the hooks of the connectors, which have been previously separated from the stud 62 carriedby-the numeral key levers 2, intoengagement with said studs,- in which position they are seen in Fig. II, and which position they retain until the locking dog 37 has wardly when permitted to 0 so. When"the last mentioned-action has taken placejthe connectors are detached from thenumeral zey levers, due to rearward movement of the rods 66 and the arms 67 by which they are carried, such movement being occasioned-by apull spring 80. a

The toothed slide bars 58 by Whichfthe integer wheels of thecalculating mechanism are operated are normally held'in elevated position and returned to elevated positions after downward movement by bell'crank levers comprising horizontal arms 81 and vertical arms82. T e forward ends of-the lever arms 81 are positioned between upper in the side walls of fthe calculatin machine frame back of the toothed slide bars 58. Springs 86 connecting the arms 82' to a fixed part of thecalculating machine serveto normally hold the arms r81 in 'an uplifted position, and the arms 82 in' a forward position. I

aving now described the parts'of'the calculating mechanism most directly assoi ated with the numeral key leversof the type writing machine. I will tion of the calculating mechanism operated by the toothed bars 58. 87 designates integer wheels fixed to a transverse shaft 88 located in front of the series of toothed slide bars 58, (see Figs. II, XII and XV). There is an individual wheel 87 for each toothed slide bar 58 which saidbar is adapted to engage, and each toothed slide bar hasa number of teeth thereon corresponding to the integer of the typewriting machine nuwhich carrv them that they will engage the corresponding integer wheel 87 and rotate it and the shaft to the size of the integer. he integer wheels are preferably of different diameters and different pitch, but the result of the degree of operation of them by the toothed slide bars 58 is not affected by-this. the purameter and pitch being solely to provide a more uniform key pressure in the typewritmg machine. The teeth of the toothed slide instance those operated by the 8 and 9 nu meralkey levers 2, engage small integer" such engagement takes" place:

wheels, and

a ain moved for proceed to the por- 88 a distance proportionate transn'nission wheel integer wheelswvhe'n at rest, and

approximately at the beginning of the downward'stroke of the toothed bars, while the toothed bars of, the lower denomina-- tions: "are considerably 4 separated from the do not-mesh wlthythe' integer wheelsuntil the: downward-strokes of the toothed bars is nearly. 3 completed. 1 l Therefore,'= 1 by integer-:wvheels of different diamete fiuan pitehes iyre wa small wheeli gforga-dar e inte er-andf-za ilargewheel do]: a anal integer-,1; the ;strokesof'the actuating. keys connectedutoflthe toothed bars 5 8 -:ar e rendered more suniformythani they would be if the;,integer-, wheels zwere not made as ,describedi-z "1 3 designates 'gearwheel leosely on thev shaft 88. near one side of the calew.

latimgmachine, said fmheel bein --providedwith a cluteliimemberl90 ada' te; ,Uto be engaged;by, aiclutchecollar'9l see Fig-.IQV); splined': the: shaft; 88 and -moyable .into engage prov-ide-ifor the 1 driving ;of-=the spur. wheel 89 ::-durin'g. the operation of thei-inte er wheels 87-.-The clutchcollar 9L is opera lei by-wShifter F comprising-afork 92 fitted to. the collar," and a lever arm 93 operable hymean'sito be hereinafter described, whereby 'ithe wheel 89 is made :torotateqwith gthef shaft =88nat, the proper time. The; spur: wheel 89. is constantly in mesh with a transmission w heelw94 in front of it, and said eshes in turn with a gear, vwheel .95. The last mentioned wheel meshes with :a pinion96 and is adapted to he engaged by a gear wheel 97 splined to the registering mechanismLshaft 15 on which the master wheel 14 is located. Thewheel 97 is shiftableqinto mesh with either the pinion 96 or thegear wheel 95. When calculations involving addition are being performed said wheel 97 'meshes with the pinion 96, so that the gear wheel 95 first drives the pinion 96 and the latter drives the wheel 97 to impart rotation to the shaft 15 and the master wheel 14. For subtraction calculation, the spur wheel 97 is shifted on the shaft 1550 that it will mesh directly with the spur wheel 95 whereby the shaft 15 and the master wheel are rotated reversely relative to the direction of movement when adding. The accumulator of my calculating attachment is one involving elements which may be operated in one direction for calculations involvin addition and in the opposite direction for calculations involving subtraction,'--the master wheel 14 being operated either forwardly or reversely according to whether addition or subtraction is to be performed. The construction of the accumulator'and its operation, to be herein: after set forth, is such that it is believed its operation in the manner here stated will be plainly understood.

their tee mentewith the clutch member90 to I .The; gear wheel 97 being s lined to the shaft 15 is required to rotate tiherewith, but to avoid 1ay =of said wheel upon said shaft Lfix, tot e shaftat one side of the wheel a clutch co llar 98, (see Fig. XIV) and at the oppos te-fs'ide-of the wheel a clutch collar 99, adapted-to interlock the hub of the gear W11 7-.;-.a

,The g r wheel. 97 is under the control of shifting and lockingparts to be next described.' 100 des gnates a shifting fork pivoted at-lQ-land fitted in a -groove in the hub of heigea'r wheel 97. This .fork is provided with a socket 10,3 which receives the lower mentioned lever. isprovided at its upper end witha finger piece 106 adapted'to be engaged by the operatonto move the lever.10 4 either-;, to the right or left .to throw the shifter -,fork 100 in a. contra direction; When the lever 104 is moved to t e right the shifter gfork carries the gear wheel 97 .to the left and intog-mesh with the pinion 96, this being the, position for addition. Movement of the lever 104 to the right operates the shifter:fork to place the gear -.wheels 95 and 97 in mes for subtraction. Considering the fact thatthe calculatin mechanism is used most extensively fora d ition I provide means. by which the lever 104 will normally be retained: in alright-hand position, orin other words, the position requiredfor the engagement of the gear wheel 97 with the pinion ,96; This means comprisesa presser arm 107 pivoted at 108. This resser arm is-located' at the left of a pin 109 fixed to the lever 104, and has connectedto it apull spring 110 by which. the arm may be drawn to the right and caused to hold the lever 104 in the extreme right hand position.

The presser arm 107 may, however, be thrown out of service and held in an inactive position The means provided for this purpose comprises a latch rod 111 rockably mounted-in the wall 5 of the calculating machine frame, said rod being provided at its outerend with a knob 112 and at its inner end with a transverse pin 113 adapted to be so turned that it will extend across the presser arm 107 and hold it retracted (as seen in Fig. XIV), hen the presser arm 107 is out of operation the lever 104 by which the shifter fork 100 is controlled is held in either the right hand or left hand position through the medium of a bar 114 pivoted to the frame of the machine at 115. Said bar has aV-shaped cam slot 116 therein, in which the pin 109 carried by the lever 104 is operable. The bar 114 is connected to the frame of the machine by a spring 117 which tends to move the slotted bar 114 downwardly and, consequently, when the pin 109 is in either leg of the V-shaped slot 116 in said bar the lever 104 is held from accidental movement due to pressure of a wall of the cam slot 116 against the' pin 109. Furthermore, when the pin 109 is thrown past ftheapex of said cam slot in either direction the'spring 117 acts to so move'the bar '114 a'sto cause the pin 109 to ride along the face of the cam slot 116to an end of said slot,"so" that the lever 104 will the lever arms 82 (see Figsl, II, V,

and XIII This fod has-fixed to itFa series of ownyv'ardly" extending. arms 120 correspond 'g' in -'humber to the number of said bell cranks'andine'achof whichis anadjustment screw 121ad'apted-tobe engaged by thebell crank lever ;arm82 in front of it when irm se is moved rearwardly -in response ,to downward movement F of the corresponding tooth "sIide' bar 58. -The" rod 119 also has fixed to=*it', awlev'er arm 122 which is inclined 'downvi ardly*-and for-' wardly and thelowerend'o'f which is operable against a in 123carried-bya pendant arm "124 loose y fitted-tothe rod 85, and movable jiiidependently Y of said rod. A spring 125' tends to draw the arm 124 toward the front of the machine. 126 is a pull rod pivoted at 127 to the lower end of the arm 124 and having'its forward end pivotallyconnected at 128 to a locking dog 129 pivoted at 130. The locking dog 129 extends vertically from its point of pivotal support and is provided at its upper end with a tooth 131 adapted to engage a ratchet wheel 132, rotatable with the transmission wheel 95, to prevent rotation of said wheel and the other elements in the train of gearing in which it is located after the dog 129 has been moved into engagement with said ratchet wheel 132. A rocker or latch device 133 extendinglongitudinally of the machine is pivotally mounted at 134 and is provided at its forward end with a shoulder 135 which engages a lug 136 at one side of the locking dog 129 to hold said dog in engagement with the ratchet wheel 132, which position it retains in an interim between the depression of the operating numeral key levers 2. A ring 137 connects the rocker 133 to a fixed part of the machineand tends to normally hold the forward end of said rocker in a lowered position and the rear arm of said rocker in an elevated position.

sitioned be-'- trolling-the shifter fork Fibyw'hich -the clutch collar on the integer wheel shaft is operated, is next'to be described. 138 is a rocker extending lon itudinall of the machine back of the shif ter'forkl and pivotally supported at 139: The forward arm of this rocker overlies the lever arm 93 'of the shifter fork F (see Fig XIII),:an.d said rocker has connected -toit a spring 140 less powerful than the spring lfaf'l'attached'to the forward rocker "133. At the terminaa cam finger 141 having upper and-lower cam faces adapted to"be traversed bywan operating membentobe presently described. 142 is a transverse having fixed to it a series'ofarms 143 his. number equal 1 to r the; number of: operating bars 58 and the bell crank lever arms81 fitted thereto. In the upper end of each arm:

143 is a notch 144 in-whicha pin 1145 carried by the'correspondin'g' arm 82 is operable; thereby rovidingifor the transmission of motion fi oin said bell crank lever arm 82 130 3.1} arm l43sland-the rock shaft 142 when an integer wheel op rating slide bar 58 is lowered. The arms 143 are normally held in the forward positlon seen in Fig. V of a retracting spring 146 attached to the rock shaft 142'.

Means is provided for varying thetension of the spring 146. This means com rises a pivotally mounted arm 146 to whic the end of said spring opposite that attached to the rock shaft 142 is connected. The mm 146" is pressed forwardly by a rockable detent arm 146 carried by a rod 146 journaled in the side wall 5 of the calculating machine frame and plovided with a knob 14(1 at. the outside of the machine. The point of the detent arm 146 is ada ted to engage teeth at the rear edge of t earm 146" to hold said arm in any position to which it may be adjusted by the detent arm, a presser arm 147 is fixed to the rock shaft 142 adjacent its end at which the rear end of the rocker 138 is located. Said presser arm extends vertically from the rock shaft and is provided at its-upperend with a cam finger 148 having top and bottom working faces which are adapted to ride in contact with the top and bottom faces of the p orwardly; The mechanism 'for operating and con rock shaftat the rear of the calculating mechanism, saidshaft bell crank lever. 

